﻿// Copyright 2009 Mike Geise
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Falcon.Core.Domain
{
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using Falcon.Core.Domain.Enums;
	using Falcon.Core.Extensions;
	using Falcon.Core.Validation;

	public class Poll : EntityBase<Poll>
	{
		// private fields
		private bool _canVote;

		/// <summary>
		/// Gets or sets the user id.
		/// </summary>
		/// <value>The user id.</value>
		public virtual int UserId
		{
			get; 
			set;
		}

		/// <summary>
		/// Gets or sets the title.
		/// </summary>
		/// <value>The title.</value>
		public virtual string Title
		{
			get;
			set;
		}

		/// <summary>
		/// Gets or sets the slug.
		/// </summary>
		/// <value>The slug.</value>
		public virtual string Slug
		{
			get;
			set;
		}

		/// <summary>
		/// Gets the votes.
		/// </summary>
		/// <value>The votes.</value>
		public virtual int Votes
		{
			get
			{
				return (this.Choices.HasValue()) ? this.Choices.Sum(x => x.Votes) : 0;
			}
		}

		/// <summary>
		/// Gets the voters.
		/// </summary>
		/// <value>The voters.</value>
		public virtual int Voters
		{
			get
			{
				return (this.Choices.HasValue()) ? this.Choices.Sum(x => x.Voters) : 0;
			}
		}

		/// <summary>
		/// Gets or sets a value indicating whether this instance can vote.
		/// </summary>
		/// <value><c>true</c> if this instance can vote; otherwise, <c>false</c>.</value>
		public virtual bool CanVote
		{
			get
			{
				return _canVote && (this.Expires > DateTime.Now);
			}
			set
			{
				_canVote = value;
			}
		}

		/// <summary>
		/// Gets or sets a value indicating whether this instance has voted.
		/// </summary>
		/// <value><c>true</c> if this instance has voted; otherwise, <c>false</c>.</value>
		public virtual bool HasVoted
		{
			get; 
			set;
		}

		/// <summary>
		/// Gets or sets the status.
		/// </summary>
		/// <value>The status.</value>
		public virtual PollStatus Status
		{
			get; 
			set;
		}

		/// <summary>
		/// Gets or sets the created.
		/// </summary>
		/// <value>The created.</value>
		public virtual DateTime Created
		{
			get; 
			set;
		}

		/// <summary>
		/// Gets or sets the updated.
		/// </summary>
		/// <value>The updated.</value>
		public virtual DateTime Updated
		{
			get;
			set;
		}

		/// <summary>
		/// Gets or sets the start.
		/// </summary>
		/// <value>The start.</value>
		public virtual DateTime Start
		{
			get; 
			set;
		}

		/// <summary>
		/// Gets or sets the expires.
		/// </summary>
		/// <value>The expires.</value>
		public virtual DateTime Expires
		{
			get; 
			set;
		}

		/// <summary>
		/// Gets or sets the choices.
		/// </summary>
		/// <value>The choices.</value>
		public virtual IList<PollChoice> Choices
		{
			get; 
			set;
		}

		/// <summary>
		/// Gets the percentage of votes from the specified choice.
		/// </summary>
		/// <param name="choice">The choice.</param>
		/// <returns></returns>
		public virtual double Percentage(PollChoice choice)
		{
			return this.Votes == 0 ? 0 : Math.Round((double)choice.Votes / (double)this.Votes * 100);
		}

		/// <summary>
		/// Validation rules for this instance.
		/// </summary>
		/// <returns></returns>
		public override Validator<Poll> Rules()
		{
			return base.Rules();
		}

		/// <summary>
		/// Validates this instance.
		/// </summary>
		public override void Validate()
		{
			this.Rules().Validate(this);
		}
	}
}